TDRbeAjq

1package br.inf.cbds.javaseguro;
2
3import javax.crypto.Cipher;
4import javax.crypto.KeyGenerator;
5import javax.crypto.SecretKey;
6import javax.crypto.spec.SecretKeySpec;
7
8public class UtilJCE {
9	
10	private KeyGenerator kgen;
11	private SecretKey secretKey;
12	private Cipher cipher;
13	private SecretKeySpec specKey;
14	
15	public UtilJCE()
16	{
17		try 
18		{
19			kgen = KeyGenerator.getInstance("Blowfish");
20			secretKey = kgen.generateKey();
21			byte[] bytes = secretKey.getEncoded();
22			specKey = new SecretKeySpec(bytes, "Blowfish");
23			cipher = Cipher.getInstance("Blowfish");
24			cipher.init(Cipher.ENCRYPT_MODE, specKey);
25		} 
26		catch (Exception e) 
27		{
28			System.out.println("Exception: " + e.getMessage());
29		}
30	}
31	
32	public static void main(String[] args) {
33
34		String senha = "123mudar";
35		
36		UtilJCE jce = new UtilJCE();
37		System.out.println("Senha original: " + senha);
38		System.out.println("Senha Criptografada: " + jce.criptografa(senha));
39		System.out.println("Senha Descriptografa: " + jce.descriptografa(senha));
40		
41	}
42	
43	public String criptografa(String senha)
44	{		
45		try 
46		{
47			byte[] encrypted = cipher.doFinal(senha.getBytes());
48			return new String(encrypted);
49		} 
50		catch (Exception e) 
51		{
52			System.out.println("Exception: " + e.getMessage());
53		}
54		return null;
55	}
56	
57	public String descriptografa(String senha)
58	{		
59		try 
60		{
61			byte[] encrypted = cipher.doFinal(senha.getBytes());
62			cipher.init(Cipher.DECRYPT_MODE, specKey);
63			byte[] decrypted = cipher.doFinal(encrypted);
64			senha = new String(decrypted);
65			return senha;
66		} 
67		catch (Exception e) 
68		{
69			System.out.println("Exception: " + e.getMessage());
70		}
71		return null;
72	}
73}